When looking for a midrange smartphone, there are a bunch of models to choose from, and two similar phones that can be your options are the "OnePlus One" and the "Asus Zenfone 2". These two phones have similar specs and they have been announced only a few months apart. The "OnePlus One" was announced April 2014 while the "Asus Zenfone 2" was announced January 2015. Here is a quick comparison of the two:
"OnePlus One" vs "Asus Zenfone 2 ZE551ML" Features, Price
Both phones have LTE support but only the "Asus Zenfone 2" has a dual sim support. Both has WiFi hotspot capabilty but only the "Asus Zenfone 2" has an FM radio feature. It's worth noting that the "OnePlus One" only costs around 250 Euro while the "Asus Zenfone 2" is at around 320 Euro.
"OnePlus One" comes in the colors of Silk White and Sandstone Black while the "Asus Zenfone 2" has the color options of Osmium Black, Sheer Gold, Glacier Gray, Glamor Red, and Ceramic White.
"OnePlus One" vs "Asus Zenfone 2 ZE551ML" Dimensions, Display
"OnePlus One" measures 6.02 x 2.99 x .35 inches while the "Asus Zenfone 2" measures 6 x 3.04 x .43 inches. The dimensions are very similar and so are their weights. The "OnePlus One" weight 5.71 oz while the "Asus Zenfone 2" weighs 6 oz. "OnePlus One" uses a LTPS LCD capacitive touchscreen and the "Asus Zenfone 2" uses an IPS capacitive touchscreen. The display specs of the two phones are pretty identical as both phones have 5.5 inch screens, a 1080 x 1920 resolution, and they both use Corning Gorilla Glass 3.
"OnePlus One" vs "Asus Zenfone 2 ZE551ML" Platform, Memory
"OnePlus One" runs Android KitKat that is upgradable to Lollipop and the "Asus Zenfone 2" runs the Android Lollipop. "OnePlus One" is powered by Snapdragon 801 chipset and a Quad core 2.5 GHz Krait 400 CPU. Its internal memory is 16/64 GB with 3 GB RAM and there is no microSD slot. The "Asus Zenfone 2" on the other hand has two variants, one having a 4 GB RAM and is powered by Intel Atom Z3580 chipset and Quad core 2.3 GHz CPU and one with 2 GB RAM and is powered by Intel Atom Z3560 chipset and Quad core 1.8 GHz CPU. The "Asus Zenfone 2" has an internal storage of 16/32/64 GB and it has a microSD slot for up to 64 GB.
"OnePlus One" vs "Asus Zenfone 2 ZE551ML" Cameras
Again, these two phones have similar specs when it comes to their cameras. Both sport a 13 MP rear cam with dual LED flash and they also both have a 5 MP front camera.
"OnePlus One" vs "Asus Zenfone 2 ZE551ML" Battery
"OnePlus One" and "Asus Zenfone 2" aren't too far away from each other when it comes to the battery. The "OnePlus One" uses a non removable Li Po 3100 mAh battery while the "Asus Zenfone 2" uses a Li Po 3000 mAh battery which is likewise non removable. The "OnePlus One" has a battery life endurance rating of 66 hours while the "Asus Zenfone 2" has an endurance rating of 59 hours.
"OnePlus One" vs "Asus Zenfone 2 ZE551ML" Conclusion
In summary, "OnePlus One" is the more affordable pick between the two, and the only differences the "Asus Zenfone 2" has over the OnePlus phone apart from the few details in the processor department is that it has a dual sim support and an FM radio. But generally, you can go for any of these two phones. If you are budget conscious, the "OnePlus One" should be an easy pick.